Respiratory function and clinical responses to theophylline guiaphenesin ("Entair").
D000368:Aged; D001249:Asthma / Q000188:drug therapy*; D001991:Bronchitis / Q000188:drug therapy*; D002986:Clinical Trials as Topic; D004809:Ephedrine / Q000627:therapeutic use*; D006801:Humans; D007545:Isoproterenol / Q000627:therapeutic use*; D008875:Middle Aged; D013806:Theophylline / Q000627:therapeutic use*
D013806:Theophylline; D004809:Ephedrine; D007545:Isoproterenol